IBM 2292 Owner's manual

Hardware Maintenance Manual
Ty pe s 2292, 2273, 6043, 6343, 6349,
6350, 6790, 6791, 6792, 6793,
6794, 6795, 6823, 6825


Hardware Maintenance Manual
Ty pe s 2292, 2273, 6043, 6343, 6349,
6350, 6790, 6791, 6792, 6793,
6794, 6795, 6823, 6825


Note: Before using this information and the product it supports, be sure to read the
general information under “Notices” on page 221.
Second Edition (September 2004)
© Copyright International Business Machines Corporation 2004. All rights reserved.
US Government Users Restricted Rights – Use, duplication or disclosure restricted by GSA ADP Schedule Contract
with IBM Corp.

Contents
Chapter 1. About this manual . . . . .1
Important Safety Information . . . . . . . . .1
Chapter 2. General checkout . . . . . .3
Chapter 3. General information . . . . .5
Identifying your computer . . . . . . . . . .5
Small desktop model computer . . . . . . .6
Desktop model computer . . . . . . . . .6
Microtower model computer . . . . . . . .6
Features . . . . . . . . . . . . . . . .7
Specifications . . . . . . . . . . . . . .9
Physical specifications — small desktop model . .9
Physical specifications — desktop model . . .10
Physical specifications — microtower model . .11
Available options . . . . . . . . . . . .12
Chapter 4. Diagnostics . . . . . . . .13
Setup Utility program . . . . . . . . . . .14
Product Recovery Program menu . . . . . . .15
Diagnostics . . . . . . . . . . . . . .16
Diagnostics program download . . . . . . .16
Navigating through the diagnostics programs . .16
Running diagnostics tests . . . . . . . . .16
Test selection . . . . . . . . . . . . .16
Test results . . . . . . . . . . . . .17
Fixed disk advanced test (FDAT) . . . . . .17
Quick and Full erase - hard drive . . . . . .19
Viewing the test log . . . . . . . . . .20
Chapter 5. External connectors . . . .21
Locating the connectors on the front of your
computer . . . . . . . . . . . . . . .21
Small desktop models . . . . . . . . . .21
Desktop models . . . . . . . . . . . .21
Microtower models . . . . . . . . . . .22
Locating the connectors on the rear of your
computer . . . . . . . . . . . . . . .23
Small desktop . . . . . . . . . . . .23
Desktop . . . . . . . . . . . . . .24
Microtower . . . . . . . . . . . . .25
Connector descriptions . . . . . . . . .25
Chapter 6. Replacing FRUs . . . . . .27
small desktop models . . . . . . . . . . .27
Locating components . . . . . . . . . .27
Identifying parts on the system board . . . .28
Removing the cover . . . . . . . . . .28
Replacing the microprocessor . . . . . . .29
Replacing the power supply . . . . . . . .30
Replacing the system board . . . . . . . .30
Replacing the speaker . . . . . . . . . .32
Desktop models . . . . . . . . . . . . .32
Locating components . . . . . . . . . .33
Identifying parts on the system board . . . .33
Removing the cover . . . . . . . . . .34
Replacing the microprocessor . . . . . . .35
Replacing the power supply . . . . . . . .35
Replacing the system board . . . . . . . .36
Replacing the fan . . . . . . . . . . .37
Microtower models . . . . . . . . . . . .37
Locating components . . . . . . . . . .38
Identifying parts on the system board . . . .39
Removing the cover . . . . . . . . . .39
Replacing the fan . . . . . . . . . . .40
Removing the front bezel . . . . . . . . .41
Moving the power supply . . . . . . . .41
Replacing the microprocessor . . . . . . .42
Replacing the power supply . . . . . . . .43
Replacing the system board . . . . . . . .44
Replacing the hard disk drive . . . . . . .44
Completing the FRU replacement. . . . . . . .45
Chapter 7. Symptom-to-FRU index . . .47
Hard disk drive boot error . . . . . . . . .47
Power Supply Errors . . . . . . . . . . .47
Diagnostic error codes . . . . . . . . . . .49
Beep symptoms . . . . . . . . . . . . .67
No-beep symptoms . . . . . . . . . . . .69
POST error codes . . . . . . . . . . . .70
Miscellaneous error messages . . . . . . . .85
Undetermined problems . . . . . . . . . .87
Chapter 8. FRU listing . . . . . . . .89
Small Desktop Model . . . . . . . . . . .89
Desktop Model . . . . . . . . . . . . .112
Microtower Model . . . . . . . . . . . . 142
Chapter 9. Additional service
information . . . . . . . . . . . . 179
Security features . . . . . . . . . . . . 179
Passwords . . . . . . . . . . . . . 179
Vital product data . . . . . . . . . . . 180
Management Information Format (MIF) . . . 180
Alert on LAN . . . . . . . . . . . . 181
BIOS levels . . . . . . . . . . . . . . 181
Flash update procedures . . . . . . . . . . 181
Flash from Operating System (WinPhlash) . . . 182
Flash from CD-ROM ISO image . . . . . . 182
Flash recovery boot block jumper . . . . . . . 183
Power management . . . . . . . . . . . 185
Automatic configuration and power interface
(ACPI) BIOS . . . . . . . . . . . . . 185
Advanced Power Management . . . . . . 185
Automatic Hardware Power Management
features . . . . . . . . . . . . . . 185
Setting Automatic Hardware Power
Management features . . . . . . . . . . 185
Automatic Power-On features . . . . . . . 186
© Copyright IBM Corp. 2004 iii

Chapter 10. Related service
information . . . . . . . . . . . . 187
Safety information . . . . . . . . . . . . 187
General safety . . . . . . . . . . . . 187
Electrical safety . . . . . . . . . . . . 188
Safety inspection guide . . . . . . . . . 189
Handling electrostatic discharge-sensitive
devices . . . . . . . . . . . . . . 190
Grounding requirements . . . . . . . . 191
Safety notices (multi-lingual translations) . . . 191
Send us your comments! . . . . . . . . . 220
Problem determination tips . . . . . . . . . 221
Notices . . . . . . . . . . . . . . . 221
Trademarks . . . . . . . . . . . . . . 222
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Chapter 1. About this manual
This manual contains service and reference information for IBM
®
computers .
This manual is divided into product service sections and a related service section,
as follows:
v The product service sections include procedures for isolating problems to a FRU,
a Symptom-to-FRU Index, additional service information and an illustrated parts
catalog.
v The related service section includes safety notices and safety information, and
problem determination tips.
Note:
This manual is intended for trained servicers who are familiar with IBM Personal
Computer products. Use this manual along with advanced diagnostic tests to troubleshoot
problems effectively.
Before servicing an IBM product, be sure to review the “Safety information” on page 187.
Important Safety Information
Be sure to read all caution and danger statements in this book before performing
any of the instructions.
Prenez connaissance de toutes les consignes de type Attention et Danger avant de
procéder aux opérations décrites par les instructions.
Lesen Sie alle Sicherheitshinweise, bevor Sie eine Anweisung ausführen.
Accertarsi di leggere tutti gli avvisi di attenzione e di pericolo prima di effettuare
qualsiasi operazione.
Leia todas as instruções de cuidado e perigo antes de executar qualquer operação.
© Copyright IBM Corp. 2004 1

Lea atentamente todas las declaraciones de precaución y peligro ante de llevar a
cabo cualquier operación.
2 Hardware Maintenance Manual Types 2292, 2273, 6043, 6343, 6349, 6350, 6790, 6791, 6792, 6793, 6794, 6795, 6823, 6825

Chapter 2. General checkout
Use this general checkout procedure is for computers supported by this Hardware
Maintenance Manual.
Attention:
The drives in the computer you are servicing might have been rearranged or the drive
startup sequence changed. Be extremely careful during write operations such as copying,
saving or formatting. Data or programs can be overwritten if you select an incorrect drive.
Diagnostic error messages appear when a test program finds a problem with a
hardware option. For the test programs to properly determine if a test Passed, Failed
or Aborted, the test programs check the error-return code at test completion. See
“Diagnostics” on page 16.
General error messages appear if a problem or conflict is found by an application
program, the operating system, or both. For an explanation of these messages, refer
to the information supplied with that software package.
Notes:
v The default boot for this computer is to start up quiet (no beep and no memory count
and checkpoint code display) when no errors are detected by POST.
v To enable beep and memory count and checkpoint code display when a successful POST
occurs, do the following:
1. Select Start Options in the Configuration/Setup Utility program (see “Setup Utility
program” on page 14.
2. Set Power-On Self-Test to Enhanced.
v
Before replacing any FRUs, ensure that the latest level of BIOS is installed on the system.
A down-level BIOS might cause false errors and unnecessary replacement of the system
board. For more information on how to determine and obtain the latest level BIOS, see
“BIOS levels” on page 181.
v If multiple error codes are displayed, diagnose the first error code displayed.
v If the computer hangs with a POST error, go to Chapter 7, “Symptom-to-FRU index,” on
page 47.
v If the computer hangs and no error is displayed, go to “Undetermined problems” on
page 87.
v If an installed device is not recognized by the diagnostics program, that device might be
defective.
001
1. Power-off the computer and all external devices.
2. Check all cables and power cords.
3. Make sure the system board is seated properly.
4. Set all display controls to the middle position.
5. Power-on all external devices.
6. Power-on the computer.
7. Check for the following response:
v Readable instructions or the Main Menu.
© Copyright IBM Corp. 2004 3

DID YOU RECEIVE THE CORRECT RESPONSE?
If NO, continue to 002.
If YES, proceed to 003.
002
If the Power Management feature is enabled, do the following:
1. Start the Configuration/Setup Utility program. See “Setup Utility program” on
page 14.
2. Select Power Management from the Configuration/Setup Utility program
menu.
3. Select APM.
4. Be sure APM BIOS Mode is set to Disabled. If it is not, press Left Arrow (}) or
Right Arrow (Æ) to change the setting.
5. Select Automatic Hardware Power Management.
6. Set Automatic Hardware Power Management to Disabled.
7. If the problem persists, continue to 003.
003
Run the Diagnostic programs. If necessary, refer to “Diagnostics” on page 16.
v If you receive an error, replace the part that the diagnostic program calls out or
go to ″Symptom-to-FRU Index″ on page Chapter 7, “Symptom-to-FRU index,”
on page 47.
v If the test stops and you cannot continue, replace the last device tested.
4 Hardware Maintenance Manual Types 2292, 2273, 6043, 6343, 6349, 6350, 6790, 6791, 6792, 6793, 6794, 6795, 6823, 6825

Chapter 3. General information
This IBM
®
computer incorporates many of the latest advances in computer
technology and can be upgraded as your needs change.
Adding hardware options to your computer is an easy way to increase its
capabilities. Instructions for installing external and internal options are included in
this publication. When adding an option, use these instructions along with the
instructions that come with the option.
Go to Access IBM for general information about the use, operation, and
maintenance of your computer. Access IBM also contains information to help solve
problems and get repair service or other technical assistance.
Identifying your computer
To properly install options, you will need to know the machine type/model of
your computer. You can find this number on the small label on the front of your
computer. An example of the machine type/model number is 6790xxx.
The information in this publication supports several computer types and models.
The following illustrations will help you identify your computer.
© Copyright IBM Corp. 2004 5

Small desktop model computer
Desktop model computer
Microtower model computer
6 Hardware Maintenance Manual Types 2292, 2273, 6043, 6343, 6349, 6350, 6790, 6791, 6792, 6793, 6794, 6795, 6823, 6825

Features
This section provides an overview of the computer features, preinstalled software,
and specifications.
Microprocessor
Intel
®
Pentium
™
4 with 256 KB of internal L2 cache memory and Intel NetBurst
™
micro-architecture
Memory
v Support for three dual in-line memory modules (DIMMs) (some models)
v 512 KB flash memory for system programs
Internal
drives
v 3.5-inch, 1.44 MB diskette drive
v Internal hard disk drive
v EIDE CD drive or DVD drive
Video
subsystem
AGP video adapter slot on the system board
Audio subsystem
16-bit integrated Sound Blaster Pro compatible audio subsystem
Connectivity
v 10/100 Mbps integrated
Intel ethernet controller that supports the Wake on LAN
®
feature
v 56k V.90 data/fax PCI modem (some models)
System
management features
v Remote Program Load (RPL) and Dynamic Host Configuration Protocol (DHCP)
v Wake on LAN
v Wake on Ring (in the IBM Setup Utility program, this feature is called Serial Port
Ring Detect for an external modem and Modem Ring Detect for an internal
modem)
v Remote Administration
v Automatic power-on startup
v System Management (SM) BIOS and SM software
v Ability to store POST hardware test results
Input/output
features
v 25-pin, Extended Capabilities Port (ECP)/Extended Parallel Port (EPP)
v Two 9-pin serial connectors
v Four 4-pin, USB connectors
v PS/2
®
mouse connector
v PS/2 keyboard connector
v RJ-45 Ethernet connector
v Monitor connector
v Three audio connectors (line in, line out, and microphone)
v IEEE 1394 connector (some models)
Chapter 3. General information 7

v Front connectors for microphone and headphone (some models)
Expansion
v Drive bays
– Small desktop model: Three
– Desktop model: Four
– Microtower model: Five
v
32-bit peripheral component interconnect (PCI) adapter slots
– Small desktop model: Three (supports low profile adapters only)
– Desktop model: Three
– Microtower model: Three
v
One accelerated graphics port (AGP) expansion slot (small desktop model
supports low profile adapters)
Power
v 160 W or 185 W power supply with manual voltage selection switch
v Automatic 50/60 Hz input frequency switching
v Advanced Power Management support
v Advanced Configuration and Power Interface (ACPI) support
Security
features
v User and administrator passwords
v Support for the addition of a Rope Clip and lockable cable (varies by mechanical
chassis)
v Startup sequence control
v Startup without diskette drive, keyboard, or mouse
v Unattended start mode
v Diskette and hard disk I/O control
v Serial and parallel port I/O control
v Security profile by device
IBM
preinstalled software
Your computer might come with preinstalled software. If it does, an operating
system, device drivers to support built-in features, and other support programs are
included.
Operating systems (supported)
v Microsoft
®
Windows XP
v Microsoft Windows 2000
v Microsoft Windows NT
®
Workstation Version 4.0
v Microsoft Windows 98 Second Edition
v OS/2
®
Operating systems (tested for compatibility)
1
v Linux
1. The operating systems listed here are being tested for compatibility at the time this publication goes to press. Additional
operating systems might be identified by IBM as compatible with your computer following the publication of this booklet.
Corrections and additions to this list are subject to change. To determine if an operating system has been tested for compatibility,
check the Web site of the operating system vendor.
8 Hardware Maintenance Manual Types 2292, 2273, 6043, 6343, 6349, 6350, 6790, 6791, 6792, 6793, 6794, 6795, 6823, 6825

v PC DOS
Specifications
This section lists the physical specifications for your computer.
Physical specifications — small desktop model
Dimensions
Height: 104 mm (4.1 in.)
Width: 360 mm (14.2 in.)
Depth: 412 mm (16.2 in.)
Weight
Minimum configuration as shipped: 8.1 kg (18 lb)
Maximum configuration: 9.1 kg (20 lb)
Environment
Air temperature:
System on: 10° to 35° C (50° to 95° F)
System
off: 10° to 43° C (50° to 110° F)
Maximum altitude: 2134 m (7000 ft)
Note: The maximum altitude, 2134 m (7000 ft), is
the maximum altitude at which the specified air
temperatures apply. At higher altitudes, the
maximum air temperatures are lower than those
specified.
Humidity:
System on: 8% to 80%
System off: 8% to 80%
Electrical
input
Input voltage:
Low range:
Minimum: 90 V ac
Maximum: 137 V ac
Input frequency range: 57–63 Hz
Voltage switch setting: 115 V ac
High range:
Minimum: 180 V ac
Maximum: 265 V ac
Input frequency range: 47–53 Hz
Voltage switch setting: 230 V ac
Input kilovolt-amperes (kVA) (approximate):
Minimum configuration as shipped: 0.08 kVA
Maximum configuration: 0.30 kVA
Note: Power consumption and heat output vary
depending on the number and type of optional
features installed and the power-management
optional features in use.
Heat output (approximate) in British thermal units (Btu)
per hour:
Minimum configuration: 257 Btu/hr (75 watts)
Maximum configuration: 686 Btu/hr (200 watts)
Airflow
Approximately 0.45 cubic meters every three minutes
(16 cubic feet every three minutes) maximum
Acoustical
noise-emission values
Average sound-pressure levels:
At operator position:
Idle: 38 dBA
Operating: 43 dBA
At bystander position - 1 meter (3.3 ft):
Idle: 33 dBA
Operating: 37 dBA
Declared (upper limit) sound-power levels:
Idle: 3.75 bels
Operating: 4.99 bels
Note: These levels were measured in controlled
acoustical environments according to the procedures
specified by the American National Standards
Institute (ANSI) S12.10 and ISO 7779 and are reported
in accordance with ISO 9296. Actual sound-pressure
levels in a given location might exceed the average
values stated because of room reflections and other
nearby noise sources. The declared sound-power
levels indicate an upper limit, below which a large
number of computers will operate.
Note: The computer is classified as a Class A or Class
B digital device. See the Quick Reference for further
information about this classification.
Chapter 3. General information 9

Physical specifications — desktop model
Dimensions
Height: 140 mm (5.5 in.)
Width: 425 mm (16.7 in.)
Depth: 425 mm (16.7 in)
Weight
Minimum configuration as shipped: 10.0 kg (22 lb)
Maximum configuration: 11.4 kg (25.0 lb)
Environment
Air temperature:
System on: 10° to 35° C (50° to 95° F)
System
off: 10° to 43° C (50° to 110° F)
Maximum altitude: 2134 m (7000 ft)
Note: The maximum altitude, 2134 m (7000 ft), is
the maximum altitude at which the specified air
temperatures apply. At higher altitudes, the
maximum air temperatures are lower than those
specified.
Humidity:
System on: 8% to 80%
System off: 8% to 80%
Electrical
input
Input voltage:
Low range:
Minimum: 90 V ac
Maximum: 137 V ac
Input frequency range: 57–63 Hz
Voltage switch setting: 115 V ac
High range:
Minimum: 180 V ac
Maximum: 265 V ac
Input frequency range: 47–53 Hz
Voltage switch setting: 230 V ac
Input kilovolt-amperes (kVA) (approximate):
Minimum configuration as shipped: 0.08 kVA
Maximum configuration: 0.3 kVA
Note: Power consumption and heat output vary
depending on the number and type of optional
features installed and the power-management
optional features in use.
Heat output (approximate) in British thermal units (Btu)
per hour:
Minimum configuration: 257 Btu/hr (75 watts)
Maximum configuration: 789 Btu/hr (230 watts)
Airflow
Approximately 0.68 cubic meters every three minutes
(24 cubic feet every three minutes) maximum
Acoustical
noise-emission values
Average sound-pressure levels:
At operator position:
Idle: 38 dBA
Operating: 43 dBA
At bystander position - 1 meter (3.3 ft):
Idle: 33 dBA
Operating: 37 dBA
Declared (upper limit) sound-power levels:
Idle: 4.8 bels
Operating: 5.1 bels
Note: These levels were measured in controlled
acoustical environments according to the procedures
specified by the American National Standards
Institute (ANSI) S12.10 and ISO 7779 and are reported
in accordance with ISO 9296. Actual sound-pressure
levels in a given location might exceed the average
values stated because of room reflections and other
nearby noise sources. The declared sound-power
levels indicate an upper limit, below which a large
number of computers will operate.
Note: The computer is classified as a Class A or Class
B digital device. See the Quick Reference for further
information about this classification.
10 Hardware Maintenance Manual Types 2292, 2273, 6043, 6343, 6349, 6350, 6790, 6791, 6792, 6793, 6794, 6795, 6823, 6825

Physical specifications — microtower model
Dimensions
Height: 444.5 mm (17.5 in.)
Width: 165.1 mm (6.5 in.)
Depth: 497.8 mm (19.6 in.)
Weight
Minimum configuration as shipped: 9.1 kg (20 lb)
Maximum configuration: 10.2 kg (22.5 lb)
Environment
Air temperature:
System on: 10° to 35° C (50° to 95° F)
System
off: 10° to 43° C (50° to 110° F)
Maximum altitude: 2134 m (7000 ft)
Note: The maximum altitude, 2134 m (7000 ft), is
the maximum altitude at which the specified air
temperatures apply. At higher altitudes, the
maximum air temperatures are lower than those
specified.
Humidity:
System on: 8% to 80%
System off: 8% to 80%
Electrical
input
Input voltage:
Low range:
Minimum: 90 V ac
Maximum: 137 V ac
Input frequency range: 57–63 Hz
Voltage switch setting: 115 V ac
High range:
Minimum: 180 V ac
Maximum: 265 V ac
Input frequency range: 47–53 Hz
Voltage switch setting: 230 V ac
Input kilovolt-amperes (kVA) (approximate):
Minimum configuration as shipped: 0.08 kVA
Maximum configuration: 0.3 kVA
Note: Power consumption and heat output vary
depending on the number and type of optional
features installed and the power-management
optional features in use.
Heat output (approximate) in British thermal units (Btu)
per hour:
Minimum configuration: 257 Btu/hr (75 watts)
Maximum configuration: 789 Btu/hr (230 watts)
Airflow
Approximately 0.79 cubic meters every three minutes
(28 cubic feet every three minutes) maximum
Acoustical
noise-emission values
Average sound-pressure levels:
At operator position:
Idle: 38 dBA
Operating: 43 dBA
At bystander position - 1 meter (3.3 ft):
Idle: 33 dBA
Operating: 37 dBA
Declared (upper limit) sound-power levels:
Idle: 4.8 bels
Operating: 5.1 bels
Note: These levels were measured in controlled
acoustical environments according to the procedures
specified by the American National Standards
Institute (ANSI) S12.10 and ISO 7779 and are reported
in accordance with ISO 9296. Actual sound-pressure
levels in a given location might exceed the average
values stated because of room reflections and other
nearby noise sources. The declared sound-power
levels indicate an upper limit, below which a large
number of computers will operate.
Note: The computer is classified as a Class A or Class
B digital device. See the Quick Reference for further
information about this classification.
Chapter 3. General information 11

Available options
The following are some available options:
v External options
– Parallel port devices, such as printers and external drives
– Serial port devices, such as external modems and digital cameras
– Audio devices, such as external speakers for the sound system
– USB devices, such as printers, joysticks, and scanners
– Security device, such as a Rope Clip
– Monitors
– IEEE 1394 devices (requires an IEEE 1394 adapter)
– SCSI devices (requires a SCSI adapter)
v
Internal options
– System memory, called dual in-line memory modules (DIMMs)
– Adapters
- Peripheral component interconnect (PCI) adapters
- Accelerated graphics port (AGP) adapters
- Small desktop models support low profile adapters only
–
Internal drives, such as:
- CD drive or DVD drive
- CD drive and DVD drive
- Hard disk
- Diskette drives and other removable media drives
For
the latest information about available options, see the following World Wide
Web pages:
v http://www.ibm.com/pc/us/options/
v http://www.pc.ibm.com/support/
You
can also obtain information by calling the following telephone numbers:
v Within the United States, call 1-800-IBM-2YOU (1-800-426-2968), your IBM
reseller, or IBM marketing representative.
v Within Canada, call 1-800-565-3344 or 1-800-IBM-4YOU.
v Outside the United States and Canada, contact your IBM reseller or IBM
marketing representative.
12 Hardware Maintenance Manual Types 2292, 2273, 6043, 6343, 6349, 6350, 6790, 6791, 6792, 6793, 6794, 6795, 6823, 6825

Chapter 4. Diagnostics
The following tools are available to help identify and resolve hardware-related
problems.
v Setup Utility program
v Power-On Self-Test (POST)
– POST Beep Codes
– Error Code Format
v
Diagnostics program
v Recovery utility
– Factory Contents
– Partial recovery
v
Repair utility
© Copyright IBM Corp. 2004 13

Setup Utility program
Attention:
A customized setup configuration (other than default settings) might exist on the computer
you are servicing. Running the Setup Utility program might alter those settings. Note the
current configuration settings and verify that the settings are in place when service is
complete.
The Setup Utility (configuration) program is stored in the permanent memory of
the computer. This program includes settings for the following:
v System Summary
v Product Data
v Devices and I/O Ports
v Start Options
v Date and Time
v System Security
v Advanced Setup
v Power Management
To
run the Setup Utility program, use the following procedure.
1. Power-off the computer and wait for a few seconds until all in-use lights go off.
2. Power-on the computer.
3. When the Setup Utility prompt appears on the screen during start-up, press F1.
The Setup Utility menu will appear.
4. Follow the instructions on the screen.
5. When finished, select System Summary to verify that any configuration
changes have been accepted.
14 Hardware Maintenance Manual Types 2292, 2273, 6043, 6343, 6349, 6350, 6790, 6791, 6792, 6793, 6794, 6795, 6823, 6825